Rainwater is not the only thing going into our storm drainage system. Urban pollution such as:
is carried by storm water into storm drains, then is piped directly into creeks. Some people make things worse by dumping used motor oil, paint, car wash suds, or other chemicals down storm drains—which is illegal.
Whatever was on our streets and parking lots winds up in our creeks, then our lakes. The pollution can choke aquatic life such as fish. Our streams and coves often look muddy when it rains. Property is eroded away. When people treat our storm drain system like a "sewer," it spoils our water quality and detracts from our quality of life.
Prevent pollution at the source! Learn how
Maintain your drain - to reduce both water pollution and street flooding
Why isn't storm water treated to remove pollutants?